This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 10 |
| 3 | 21 |
| 4 | 110 |
| 5 | 233 |
| 6 | 1220 |
| 7 | 2584 |
| 8 | 13530 |
| 9 | 28657 |
| 10 | 150050 |
| 11 | 317811 |
| 12 | 1664080 |
| 13 | 3524578 |
| 14 | 18454930 |
| 15 | 39088169 |
| 16 | 204668310 |
| 17 | 433494437 |
| 18 | 2269806340 |
| 19 | 4807526976 |
| 20 | 25172538050 |
| 21 | 53316291173 |
| 22 | 279167724890 |
| 23 | 591286729879 |
| 24 | 3096017511840 |